Maarten C. Verbraeken

University of St Andrews

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John T. S. Irvine

University of St Andrews

Peter Holtappels

Karlsruhe Institute of Technology

Stefano Brandani

University of Edinburgh

T. Ramos

Université de Picardie Jules Verne

Frank Tietz

Forschungszentrum Jülich

Bhaskar Reddy Sudireddy

Technical University of Denmark

Boris Iwanschitz

Hexis (Switzerland)

Qianli Ma

Forschungszentrum Jülich

Mark Cassidy

University of Melbourne

Jürgen Malzbender

Forschungszentrum Jülich

Cooperative Institutions

University of St Andrews

St. Andrews University

Technical University of Denmark

Forschungszentrum Jülich

University of Edinburgh

Pohang University of Science and Technology

Swiss Federal Laboratories for Materials Science and Technology

Hexis (Switzerland)

Centre National de la Recherche Scientifique

Center of Research and Technologic Development in Electrochemistry

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Assessment of full ceramic solid oxide fuel cells based on modified strontium titanates

Peter Holtappels T. Ramos Bhaskar Reddy Sudireddy S. Veltzé Luise Theil Kuhn

Strontium titanate

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A Solid Oxide Fuel Cell with Lanthanum and Calcium Co-Doped Strontium Titanate as Support

ECS Transactions (2013)

Lanying Lu Maarten C. Verbraeken Mark Cassidy John T. S. Irvine

Alternative anodes are of great interest for robust solid oxide fuel cells (SOFCs). A-site deficient strontium titanate co-doped with lanthanum and calcium, La 0.2 Sr 0.25 Ca 0.45 TiO 3 (LSCT A- ), has been investigated as a potential anode for SOFCs. Flat multilayer ceramics have been produced by controlling the sintering behavior of LSCT A- , resulting in a 450 µm thick porous LSCT A- scaffold with a well adhered 40 µm dense YSZ electrolyte. Impregnation of CeO 2 and Ni has resulted in power densities of 0.96 Wcm -2 at 800 o C, higher than 0.125 Wcm -2 without impregnation and 0.38 Wcm -2 for Ni alone, demonstrating encouraging performance. Work continues to improve understanding of catalyst-scaffold interactions and scaling up the concept.

Lanthanum

Strontium titanate

Calcium titanate

Cerium oxide

10.1149/05701.1415ecst

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Citations (6)

Evaluation of Ca Doped La_0.2Sr_0.7TiO₃as an Alternative Material for Use in SOFC Anodes

Journal of The Electrochemical Society (2012)

Maarten C. Verbraeken Boris Iwanschitz Andreas Mai John T. S. Irvine

Doped strontium titanates have been widely studied as potential anode materials in solid oxide fuel cells (SOFCs). The high n-type conductivity that can be achieved in these materials makes them well suited for use as the electronically conductive component in SOFC anodes. This makes them a potential alternative to nickel, the presence of which can be a major cause of degradation due to coking, sulfur poisoning and low tolerance to redox cycling. Here anode performance results are presented for an A-site deficient strontium titanate co-doped with lanthanum and calcium on the perovskite A-site, La0.20Sr0.25Ca0.45TiO3 (LSCTA-). LSCTA- anodes and LSM cathodes were screen printed on 160 μm thick 6-ScSZ electrolyte supports. The LSCTA- anode backbone showed poor electrode performance, but its conductivity was sufficient to keep ohmic losses low. Upon impregnation with combinations of ceria and nickel, ohmic losses and polarization impedances are significantly reduced, resulting in a drastic improvement in anode performance. Unexpectedly, the performance of cells impregnated with both ceria and nickel showed an improvement upon redox cycling. A stable area specific resistance of 0.37 Ωcm2 was achieved after 20 redox cycles and 250 hours of operation at 900°C in H2 with 8% H2O, showing excellent redox stability.

Ohmic contact

10.1149/2.001212jes

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Citations (61)

Modified strontium titanates: from defect chemistry to SOFC anodes

RSC Advances (2014)

Maarten C. Verbraeken T. Ramos Karsten Agersted Qianli Ma C. Savaniu

A review describing how compositional design of modified strontium titanates can lead to conductive, redox stable SOFC anodes.

Strontium titanate

10.1039/c4ra09751c

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Citations (83)

Doped alkaline earth (nitride) hydrides

Maarten C. Verbraeken

Alkaline earth metal

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The Influence of Mixed Ionic Electronic Conductivity in the Hydrogen Electrode Reaction in Solid State Electrochemical Cells

ChemInform (2006)

Peter Holtappels Maarten C. Verbraeken David H.A. Blank Bernard A. Boukamp

Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract, please click on HTML or PDF.

10.1002/chin.200636215

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Citations (1)

Understanding CO2 adsorption in a flexible zeolite through a combination of structural, kinetic and modelling techniques

Separation and Purification Technology (2020)

Maarten C. Verbraeken Roberto Mennitto Veselina Georgieva Elliott L. Bruce Alex Greenaway

10.1016/j.seppur.2020.117846

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Citations (17)

Accurate blank corrections for zero length column experiments

Adsorption (2020)

Maarten C. Verbraeken Alessio Centineo Luigi Canobbio Stefano Brandani

Abstract In this study we present a new methodology for correcting experimental Zero Length Column data, to account for contributions to the measured signal arising from extra-column volumes and the detector. The methodology considers the experimental setup as a series of mixing volumes with diffusive pockets whose contributions to the overall measured signal can be accurately described by simple model functions. The composite effect of the individual contributions is subsequently described through the method of convolution. It is shown that the model parameters are closely related to the physical characteristics of the setup components and as such they remain valid over a range of process conditions. The methodology is firstly validated through fitting to experimental experiments without adsorbent present. The inverse procedure of deconvolution can in turn be applied to experimental data with adsorbent, to yield corrected data which can readily be modelled using standard tools for equilibrium and kinetic analysis. A number of case studies is finally presented exemplifying the effect of applying accurate blank corrections, demonstrating also the application to a nonlinear adsorption system.

Convolution (computer science)

SIGNAL (programming language)

Blank

10.1007/s10450-020-00281-w

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Citations (14)

Oxygen deficient layered double perovskite as an active cathode for CO₂ electrolysis using a solid oxide conductor

Faraday Discussions (2015)

Tae Ho Shin Jae‐ha Myung Maarten C. Verbraeken Guntae Kim John T. S. Irvine

A-site ordered PrBaMn2O(5+δ) was investigated as a potential cathode for CO2 electrolysis using a La(0.9)Sr(0.1)Ga(0.8)Mg(0.2)O3 (LSGM) electrolyte. The A-site ordered layered double perovskite, PrBaMn2O(5+δ), was found to enhance electrocatalytic activity for CO2 reduction on the cathode side since it supports mixed valent transition metal cations such as Mn, which could provide high electrical conductivity and maintain a large oxygen vacancy content, contributing to fast oxygen ion diffusion. It was found that during the oxidation of the reduced PrBaMn2O(5+δ) (O5 phase) to PrBaMn2O(6-δ) (O6 phase), a reversible oxygen switchover in the lattice takes place. In addition, here the successful CO2 electrolysis was measured in LSGM electrolyte with this novel oxide electrode. It was found that this PrBaMn2O(5+δ), layered perovskite cathode exhibits a performance with a current density of 0.85 A cm(-2) at 1.5 V and 850 °C and the electrochemical properties were also evaluated by impedance spectroscopy.

10.1039/c5fd00025d

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Citations (86)

Aqueous Processing Routes for New SOFC Materials

Ceramic engineering and science proceedings (2013)

Maarten C. Verbraeken Mark Cassidy John T. S. Irvine

This chapter contains sections titled: Introduction Experimental Results Discussion Conclusions Acknowledgements

Materials processing

10.1002/9781118807750.ch6

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Citations (2)